Lilith, a devil, has an affair with an angel and ends up getting pregnant. She gives birth to twin daughters. Alita, the eldest, is born with more angelic blood and is given up for adoption. Kira, the little sister, is born with more devil blood and is raised by Lilith. They have never met or known about each other. Until Saya, a seven-year-old devil, is befriended by Alita. When Saya learns that Alita is an angel, she leaves her. While traveling north, she discovers a girl, Kira, that is identical to Alita but is a devil, killing an angel in the park. Saya follows her back to her condominium. Kira introduces herself, and they become friends. Over the years, Saya falls in love with Kira, but after eleven years, Saya is unable to get rid of the memory of Alita. She decides to kill Alita. Saya ends up getting killed by Alita. Kira finds out that the angel that killed Saya is her twin sister. She becomes obsessed with wanting to kill Alita. A war starts between them. Family and friends will get pulled along in their fight. Love and death arises all around them. The love drives everyone.